It is reported Mancini stepped in after Balotelli went in too strongly on team-mate Scott Sinclair for the City boss' liking.
Balotelli is reported to have taken exception to Mancini's intervention, leading to the pair having to be pulled apart.
In the sequence of pictures, Mancini is seen striding towards Balotelli, pointing in an aggressive manner.
He is then seen to grab hold of Balotelli's orange bib in an apparent act of fury before the young striker is dragged away by a member of City's coaching staff.
A short time later, Balotelli is believed to have left the training ground at Carrington, on the outskirts of Manchester.